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N. J. Stoyer, D.C. Hoffman, R. J. Silva

Cation-cation complexes of PuO₂⁺ and NpO₂⁺ with Th⁴⁺ and UO₂²⁺

Cation-cation complexes of NpO₂⁺ and PuO₂⁺ with UO₂²⁺ and Th⁴⁺ were studied using laser-induced photoacoustic spectroscopy (LIPAS). An equilibrium constant of 2.4±0.2 M^-1 was measured at an ionic strength of 6.0 M for the NpO₂⁺ · UO₂²⁺ complex which is in good agreement with previous measurements using conventional absorption spectroscopy and Raman spectroscopy. Equilibrium constants of 1.8±0.9 and 2.2±1.5 M^-1 were measured for NpO₂⁺ · Th⁴⁺ and PuO₂⁺ · UO₂²⁺ complexes at an ionic strength of 6.0 M, respectively. This is the first time that LIPAS has been used to study cation-cation complexes and the first time that the PuO₂⁺ · UO₂²⁺ cation-cation complex has been reported.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 05/2000
Pages: 279

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